ANTENNA DEVICE

[OBJECT] In an antenna device including multiple antennas, each other's influence of the antennas on the characteristics of the antennas is suppressed.[SOLUTION] An antenna device includes: a case; a base configured to form an accommodation space with the case; and a first antenna and a second antenna, the first and second antennas being housed in the accommodation space, wherein the first antenna operates with radio waves in a first frequency band, the second antenna including a first element including a plurality of parallel resonators configured to resonate in the first frequency band, and first connecting portions each configured to connect the parallel resonators immediately adjacent to each other in the plurality of the parallel resonators, and a second element configured to be connected to the first element, and the second antenna operates with radio waves in a second frequency band different from the first frequency band.